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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20b188d1c249f02d8907790c37d40fcfb2d43f767d1ea386c1c38f7e46952d4' 
  AND token = 'WBhw5eNyxa+wwX3Ju3Rn5Xu/lM6OP4NHjxzZW0NRol0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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