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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f64bed1e13d9ab0fdaa464672e8d853e3652096de1de3a163356a67407a605' 
  AND token = 'AlMjGKzOt72mK6oGUEC6mtR8E0XzFXqAKqyoqFXUZtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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