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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5040a941a22dbeb75c7e9ff92e06715bc536ce6816ca647d93ec4a5f05ae527d' 
  AND token = 'Ppv+OwQBSsrpHe07jOd+fqhhBMe2N4A+w3Nrz8YoNKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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