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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da12299f61a7e48c750f2a367c40a86ed992c18beb834af48ead505a3dbbab4a' 
  AND token = 'hITxdAOteNud+8/ZqiK5lXZ+fOgPpu9ki0SmBnQhteo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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