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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f8e9553affc087b7f759914def109ac6b70883e2ac3d8a29c37e49d6e18a1e' 
  AND token = 'XZW00vUwpTjB4kvEeuY3wd3O6pTmUNJ03S08VveIeAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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