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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f116bceb013b68a0eb9d7e2cb91e6fdbee7c80d44dc4568bce4dd8979242b672' 
  AND token = 'CwiQMmUgWAyp0ZDhDLXOAgmEGrIIQBZ9NiYPlc76LEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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