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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a1f32e6df4659a11ef731b68cec0d81d006cf2b6d29152a3ddcf7d5364dbb3' 
  AND token = 'NAxrACj/YXMF7GiYsBECU/C2hoCgnVlcS0kB5Tb4fK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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