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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a8e8a121d2d8a084725c7f4e484ded7cd0b4749c8b34283a1eab76c6c91fa0' 
  AND token = 'r0toE6HTHhTi7/AvVXg2Ufhf90FTOCIDlReFe4zdDmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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