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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f608017b4160454648812c02e33a2987b06b2ed1b619dcba4944803f0e0994' 
  AND token = 'hkvcHv6VRG37he6Q4nwt1FJh7uYVbyyB2gmsknV+c8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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