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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6303cfa0f5f13beb3ea6452859953d9a6810faded42eb6e0f30e6eb9f03d1943' 
  AND token = 'IcfwOio4d0lmucKzkREMd3B+cUspyy/w3+PiQfNwKL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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