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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '806095c58e52e11153f3493477b30c87930b1e9494a8fb4e011ea42025deecae' 
  AND token = 'LEPoGtMdju9Ik7w17mxva+rMOt7UEFAX7UBA9zCGafY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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