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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b4ae938d408c8ea52718310cf0f1125b0a4a30215f846ef8aca3da53165eccb' 
  AND token = 'Lg4Vd1IklIvAKnJe5pMLKRl0ZmwOd4OHPKpmjIKc/EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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