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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a3c89c6bca595e7e20a2b012b5578ff4311650d5b716e74a38f22d4e4771393' 
  AND token = '2ZZxgVUooDkoE/Y3n6BQPj2t5r5Mww1Vdcy9GbpL75g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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