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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8794e04418495cd7f17e84f30efa5467a73523a5e7d2400cda0c8e2dfbdcafc' 
  AND token = '7cU4ePKOKQIPcbXjKGyd4XMQbpYXGV/E1gNCoKIT+nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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