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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3518f7fa96ff17e045c775dcdef0d4194ba397db4d3626b50412d80e817c58' 
  AND token = 'fH6n7iKp3wk8l/kv6Z9xzFiEIC4LGuco1nRn9k7MKfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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