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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285ec8aa91ed1894647e0b2861a4bfa370bc892316191dc61255db62c25e0ddd' 
  AND token = 'kELq4M3avd9R1U1tPOAum2uCZ5cHUVPf6HVyGE2L+KI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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