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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7951fac9f732cd7e5ad9ec0e7ed20a87454acbfe06a94e6e78605fef04a173fa' 
  AND token = 'hujMwOGHwk6E+PlMsTMd3Ucz42mabYlg640ANZRdiio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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