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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1174ab572280c8126344584fe31e3dd542d000b014da1eff87f3250c392d4dc3' 
  AND token = 'Q4XEDsxV1GN0aNj/KTnLCXRomocfC2d7+07ysy3X3B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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