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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776dfc1660ce1d5668a0c180acb4d1fb7d62e41877511b24eba87efee73a5ef0' 
  AND token = 'n4erVDe1VDFr9/5G9IiYC2jK6844+xow+5Munn4l5/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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