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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a55d70d5ed09209243e8ca098427f41d2a652c9bdab07b3cc591d1c2d02379e5' 
  AND token = 'zU4ciSmWcGHRB2/XEHd0ckV+RktlfDN5aQpyR8qYMGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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