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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a980aa98b30d83b028795acb2b47628ebccb3b84394c3d7fdac9cbf17179784d' 
  AND token = '0psu+Cql+HpadpQzNn/ecQEzyy1ozgaGHwxFah5Hfi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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