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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d233635c1fb1096469d307164898d8e11ba0bc8d0f2ae5990bf66d02773221f' 
  AND token = 'e9aeEeRg00utoo+jzJL7OGNiLypgerGLaB+68CnUMPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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