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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c483eda2de6baa1d30ecabbc1bcbe739cec88592c6bab35bae3c7a9a0dde3340' 
  AND token = '1ts96jADfZZ3RbPmjApxs2wD+cV3Ye3m3EPRgER9jcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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