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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fa82e60b6561815015398ec5f6f0689a7ceb227aab683d00d16d39b51a939b8' 
  AND token = 'BExwwNGLJthRMD6Cm1vw350SY/Feh8skGMXd3E6TCEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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