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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b13db1929f34024f6b13e796325004f655790466ad8a5d1002401045bfa02b5' 
  AND token = '67pfiZlC7nmmm/kOFlsMFmfockWWQea0hN0wRNmNK9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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