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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2df4b02312997e89b4a17c7a5d712ef29e5026f7d4eaece1ddad5a2f2ca39c26' 
  AND token = '602iuC6WI6YYXP7Oxc4ejGnpzdBlvxTVADdogQYQUN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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