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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83c04e37aa020336447dd6701652eb4d81ae3051345437c19e0c4d830f9347d' 
  AND token = 'aKzldTGyCrrasMi310Eq00j8qWPUXybcnZAjai7nBW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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