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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87076108e38ca34084bed0cb1e2f73a591e9e09f5309eff9e3ad3ddfef0b2a46' 
  AND token = 'LJgGgf2ONLH/PZ0YV6+R/LZEX4OX++OKLIBQIQ++WDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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