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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d73d6b868ac4fe9b9073735b0215e8d03708c16ea8fbf7c63acfb60e29cdb4' 
  AND token = 'KW2tV5OwiHLKHA4npdWfm+hP2VvfwO66fezItAWACnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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