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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0824f6c092573f2d00747ab587fa98b590a69bc78057e46766b25117a3123ef' 
  AND token = 'kCIRlLkgCe4sYQmdxPZlXjkf1HhXt8wRjADIce7nF9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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