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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7af680ae806ab00e38657ce2422186133bdc51afff101c14c8ab76d285200441' 
  AND token = 'vbznUjAdj+QzKs0cl2UfmD6s2zep70x7q2/4JSqILjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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