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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fd933976f4456398b0d2acfe0cf85f6695ca1d9999781c33e6279b1af72a97' 
  AND token = 'Vj6bAVDE93Ch4YHQYrB2uJe5diPQ33k4wwcuVGpX3Lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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