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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0006d71cdbaf529f46b2cc88fe160bc172acd9c7bbdfa0829783c687723dd915' 
  AND token = 'jFbjhr6PtdlxN2YvVeX92wWf3r1YGCX+UES5kW22/LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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