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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e305fa4f40b89727b8aa69d44b77e90485d053e114aaec7702ed1148e39e7268' 
  AND token = '8pOcmFihyrD/Lp48I3vz1EBB+cllah33O8kwe1mChzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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