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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a77a15a72e7b1f63da98aed4c08116d024f90e5f2bea0acaa920c5c51deca5b' 
  AND token = '13NedLUuq7hXS5/37QexLV7kHyBd/Qfcd74Zj7xG8Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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