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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96e512cc17b2b5857520d23c2b44d68ea381caebb76f7c0abeb22252a283601' 
  AND token = 'lQB+aoUkSIt4nJvoojZIOVNdWIgXcAQDYcH61AsMsbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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