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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074ee1477fc66b05c2d76a381434b6959dba34ae1f085ebc224929f34a5269ba' 
  AND token = 'YVK1Gh7kLE4NddLLbz7q2qAVBz8Sm4JCr82AYioAyc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}