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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3e2d6539975ff9788b2a1b8305a7837890b96aa439fe19b667f34c017e8571' 
  AND token = 'RNAg0w3hR8akGpbWg5fTa3i2qp3gZiP272guknCBS50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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