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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11e08ded24fbd20fd1d9957e7918d48688fd775232d0962a4fa195c2a6f57c39' 
  AND token = 'ppsJspslKyYaHiwqMG3wN9980J7PwNdNxYGlGLdSRNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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