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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b2c6aa389f198c573b4b21b5cc11809d7c4a6a90c2df7c9314647911674f4d' 
  AND token = '03cNuzT5OG5y0dDbLOJXotb9z/sHAFMRC76ZtCrEDg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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