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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6158d056ae1d21de63d5cc69b6fc0357887f937ab5c55b20651f69c1f3106c5' 
  AND token = 'ishv6HZpU0QCMV60ntM39jd6dfJoa9tQlhoFfXIrTLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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