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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd91c04c84d022fe8155354ec8dfd99788e16102e6e9910e0b3e33a8b6f9f418' 
  AND token = 'lM8c0Z7XR4wsiQS9G3JklgBi2069mfQ/BdqXpCJiYZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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