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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a0030bc8050ee0feb4c68fc5b22746d597333c33fdf030750c9a9e6294c7d0e' 
  AND token = 'ft6ltuj/vbNx1uoWz3TJhPa9JGG7tCPcqeUhdC7i1C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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