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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf6d43367ec9428d61bbef86308feb1e567ad6c7142a86d5e05758f7fccdbac6' 
  AND token = 'iIaJ0VMKh7ib0Ux+c9w1GQxD8EzvlRpx3dz3EOaIWVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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