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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb9a86353f1ecf37919c520e8ec8f30a216052c87d1a641db58bc59a63b7555' 
  AND token = '8Fo8MIb+3TvRhHTG98H6QGjlHBC8fpB2zP4+18ACsSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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