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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a384ea175dae78def1263e31110afa51b89cb3d24b3c113c76575613d9ae814' 
  AND token = 'j9n8CN3P2e5zeL80WNFms9dDndaO8uNWTIOInV6OVVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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