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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ca043954afb1f9d0febb4d9d12fa62c50226023e5e9cd392b1e210da4b40aa' 
  AND token = 'aDP68qiD4ijOHd/UlWbacH5EKy0A0oikyqgPMspVWok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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