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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d7abc4ed03694d24ffc090406c8499b719e21b890f419f029b1f2f585dd61e4' 
  AND token = '8UX3juuXm2EkNQIbA5nFvMrh9T5cPqMKVEFV3Vp4P08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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