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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d4967310eab0cefcd5d81900c8b1bffcb5c9020bbe933b91fcda079b2bb10b' 
  AND token = 'vLjquy8xNnbpj0CS2yuN9GRb8h6ZesG/YF1fhonqcGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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