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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62532afd68ecc931fe9fc560ff73e16f13bc3704a5afe3ced733f2f9924c4b0e' 
  AND token = 'GIPkNBVYQEAfIeDfgX3nzvfRNOOAY7TVtVYYPZV0aIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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