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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776d0424d274e79381eccab9744b8d228acea635bdd30217405e686381517b8d' 
  AND token = 'ODR/ZMfUgsEgk4dp9Gz7C9HiLZX3ZDI+BN4Q+B1dLDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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