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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '602afbf5c35086bb9e2c24137ee7212d6abf84c1a41d28fce15c9d1121f63f8c' 
  AND token = 'UYQ2s91ARqUgB8wcMhZk1yzddvHZPNSWLjFgn1CE/AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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