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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0fd8e0c53f99a78cfbd629789da981e9d620dc5ec22ab5716b7e0e2c5d79a2' 
  AND token = 'BBEFBvGTRGeTzpWEUkN2DuYY49HGqHeRsPp2O7ebTt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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