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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eb29a8396eda056aa2a4c49a8c118c61ce9f1a19a97c4796afedeb39814f5a2' 
  AND token = '+yFcOrCoSmUHxb8bVCJ4QNnFkeraJCWKLLo/0i0eLr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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