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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5268660f92a38139fc1a74b539c78feaac63aa956e43f7f13ccc7a6c04f5e9c3' 
  AND token = '+PDyzZr2HqDRE2D8EON4FoA9d70zo96Wa9L66m/WbDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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