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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8f95d7b9629b2345c808bbf0601d23418f73c5f0ecb714c5c3706ddc369a0d' 
  AND token = 'k1167zBx/KasvqsEtvOxIcqoCMnMvdFO1T9E96KIcvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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