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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38d981a1f5d4978cd499d9bbaa37782c9b76382f6a5f2f01159c1a7f7b18de73' 
  AND token = '0AG828r1hHkMnW1brgpDuA+6n9cOTWIyjc+CS3LbXoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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