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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a27a26d79d53022c2b2395ff4cfc93374180c3c973402afb96bd7aac42668e' 
  AND token = 'ePWry6WUJwf+aGo95UcXC7CedU0BLdUIknesxCz+9gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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